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[Qemu-devel] [RFC PATCH v3 7/9] vfio/pci: Fixup PCI option ROMs
From: |
Alex Williamson |
Subject: |
[Qemu-devel] [RFC PATCH v3 7/9] vfio/pci: Fixup PCI option ROMs |
Date: |
Tue, 16 Feb 2016 14:32:31 -0700 |
User-agent: |
StGit/0.17.1-dirty |
Devices like Intel graphics are known to not only have bad checksums,
but also the wrong device ID. This is not so surprising given that
the video BIOS is typically part of the system firmware image rather
that embedded into the device and needs to support any IGD device
installed into the system.
Signed-off-by: Alex Williamson <address@hidden>
---
hw/vfio/pci.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 8e20781..d0d0864 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -832,6 +832,36 @@ static void vfio_pci_load_rom(VFIOPCIDevice *vdev)
break;
}
}
+
+ /*
+ * Test the ROM signature against our device, if the vendor is correct
+ * but the device ID doesn't match, store the correct device ID and
+ * recompute the checksum. Intel IGD devices need this and are known
+ * to have bogus checksums so we can't simply adjust the checksum.
+ */
+ if (pci_get_word(vdev->rom) == 0xaa55 &&
+ pci_get_word(vdev->rom + 0x18) + 8 < vdev->rom_size &&
+ !memcmp(vdev->rom + pci_get_word(vdev->rom + 0x18), "PCIR", 4)) {
+ uint16_t vid, did;
+
+ vid = pci_get_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 4);
+ did = pci_get_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 6);
+
+ if (vid == vdev->vendor_id && did != vdev->device_id) {
+ int i;
+ uint8_t csum, *data = vdev->rom;
+
+ pci_set_word(vdev->rom + pci_get_word(vdev->rom + 0x18) + 6,
+ vdev->device_id);
+ data[6] = 0;
+
+ for (csum = 0, i = 0; i < vdev->rom_size; i++) {
+ csum += data[i];
+ }
+
+ data[6] = -csum;
+ }
+ }
}
static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size)
- [Qemu-devel] [RFC PATCH v3 0/9] vfio: capability chains, sparse mmap, device specific regions, IGD support, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 1/9] vfio: Add sysfsdev property for pci & platform, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 2/9] vfio: Wrap VFIO_DEVICE_GET_REGION_INFO, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 3/9] vfio: Generalize region support, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 4/9] vfio/pci: Convert all MemoryRegion to dynamic alloc and consistent functions, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 5/9] linux-headers/vfio: Update for proposed capabilities list, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 6/9] vfio: Enable sparse mmap capability, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 7/9] vfio/pci: Fixup PCI option ROMs,
Alex Williamson <=
- [Qemu-devel] [RFC PATCH v3 8/9] vfio/pci: Split out VGA setup, Alex Williamson, 2016/02/16
- [Qemu-devel] [RFC PATCH v3 9/9] Intel IGD support for vfio, Alex Williamson, 2016/02/16
- Re: [Qemu-devel] [RFC PATCH v3 0/9] vfio: capability chains, sparse mmap, device specific regions, IGD support, Tian, Kevin, 2016/02/17